The surface area of a spirit is 7.85π ft. What is the radius of this spear?
To find the radius of the sphere, we can use the formula for the surface area of a sphere:
Surface Area = 4πr^2
Given that the surface area is 7.85π ft, we can plug this value into the formula:
7.85π = 4πr^2
Divide both sides by 4π:
r^2 = 7.85 / 4
r^2 = 1.9625
Take the square root of both sides to find the radius:
r = √1.9625
r = 1.4
Therefore, the radius of the sphere is 1.4 feet.